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प्रश्न
If a rod of soft iron is placed within hollow tube of solenoid and electric current is passed, the arrangement is called:
विकल्प
powerful solenoid
strongly magnetic solenoid
electromagnet
all of these
MCQ
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उत्तर
Electromagnet
Explanation:
A solenoid with a soft iron core inside it is called an electromagnet. The soft iron becomes magnetised when current flows, so the arrangement behaves as a temporary magnet.
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